Wolbachia-induced incompatibility precedes other hybrid incompatibilities in Nasonia
Wolbachia-induced incompatibility precedes other hybrid incompatibilities in Nasonia
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DOI：
10.1038/35055543
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发表时间：
2001-02-08
期刊：
影响因子：
64.8
通讯作者：
Werren, JH
中科院分区：
文献类型：
--
作者：
Bordenstein, SR;O'Hara, FP;Werren, JH
沃尔巴克氏菌是一种细胞质遗传的细菌，会导致昆虫的许多生殖变化，包括细胞质不亲和性(1，2)，即精子和卵子之间的不亲和性，导致受精后精子染色体的丢失。据估计，沃尔巴克氏菌感染了所有昆虫物种的15%-20%(3)，在蜘蛛类、等足类和线虫中也很常见(3，4)。因此，沃尔巴克氏菌引起的细胞质不亲和性可能是促进无脊椎动物快速物种形成的一个重要因素(5)，尽管这一论点存在争议(6，7)。在这里，我们表明，两个密切相关的昆虫物种(寄生黄蜂和长角新蜂)之间高度的双向细胞质不亲和性先于其他交配后生殖障碍的进化。沃尔巴克氏菌的存在严重降低了种间杂交后代的出现频率。然而，对昆虫进行抗生素治疗会产生杂交后代。此外，F-1和F-2杂交种是完全可行和可育的，这表明F-1和F-2杂交种没有崩溃。部分种间性隔离是存在的，但它是不对称和不完全的。我们的结果表明，沃尔巴克氏菌诱导的生殖隔离发生在该系统物种形成的早期阶段，在其他交配隔离机制(如杂交失活和杂交不育)进化之前。
Wolbachia are cytoplasmically inherited bacteria that cause a number of reproductive alterations in insects, including cytoplasmic incompatibility(1,2), an incompatibility between sperm and egg that results in loss of sperm chromosomes following fertilization. Wolbachia are estimated to infect 15-20% of all insect species(3), and also are common in arachnids, isopods and nematodes(3,4). Therefore, Wolbachia-induced cytoplasmic incompatibility could be an important factor promoting rapid speciation in invertebrates(5), although this contention is controversial(6,7). Here we show that high levels of bidirectional cytoplasmic incompatibility between two closely related species of insects (the parasitic wasps Nasonia giraulti and Nasonia longicornis) preceded the evolution of other postmating reproductive barriers. The presence of Wolbachia severely reduces the frequency of hybrid offspring in interspecies crosses. However, antibiotic curing of the insects results in production of hybrids. Furthermore, F-1 and F-2 hybrids are completely viable and fertile, indicating the absence of F-1 and F-2 hybrid breakdown. Partial interspecific sexual isolation occurs, yet it is asymmetric and incomplete. Our results indicate that Wolbachia-induced reproductive isolation occurred in the early stages of speciation in this system, before the evolution of other postmating isolating mechanisms (for example, hybrid inviability and hybrid sterility).